import re
from django_redis import get_redis_connection
from rest_framework import serializers
from rest_framework_jwt.settings import api_settings

from celery_tasks.email.tasks import send_verify_mail
from users.models import User, Address


# 邮箱信息  邮箱序列化器  保存邮箱信息 create()方法
class EmailSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields  =('id','email')
        extra_kwargs = {
            'email':{
                'required':True
            }
        }
    def update(self, instance, validated_data):
        email = validated_data.get('email')
        instance.email = validated_data['email']
        instance.save()

        # 发送激活邮件
        # 生成激活链接
        verify_url = instance.generate_verify_email_url()
        # 发送,注意调用delay方法
        send_verify_mail.delay(email,verify_url)
        return instance


# 用户中心个人信息
# ModelSerializer  自带创建（create）和修改(update)行为
class UserDetailSerializer(serializers.ModelSerializer):
    """
        用户详细信息序列化器
    """
    class Meta:
        model = User
        fields = ('id','username','mobile','email','email_active')


class RegisterCreateSerializer(serializers.ModelSerializer):
    """
       创建用户序列化器
       添加token
    """

    token = serializers.CharField(label='登录状态token', read_only=True)  # 增加token字段

    # 用户再进行提交的时候有3个数据:校验密码,短信验证码,是否同意协议
    # 所以,我们需要定义三个字段
    password2 = serializers.CharField(label='校验密码',allow_null=False,allow_blank=False,write_only=True)
    sms_code = serializers.CharField(label='短信验证',max_length=6,min_length=6,allow_null=False,allow_blank=False,write_only=True)
    allow = serializers.CharField(label='是否同意协议',allow_null=False,allow_blank=False,write_only=True)

    class Meta:
        model = User
        # 增加token
        fields = ('id', 'token', 'username', 'password', 'password2', 'mobile', 'sms_code', 'allow')
        # 选项修改和验证
        extra_kwargs = {
            'id': {'read_only': True},
            'username': {
                'min_length': 5,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许5-20个字符的用户名',
                    'max_length': '仅允许5-20个字符的用户名',
                }
            },
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'mxa_length': '仅允许8-20个字符的密码'
                }
            }

        }


    # 进行校验
    # 单个字段的校验有 手机号码,是否同意协议
    # 1.手机号
    def validate_mobile(self, value):
        if not re.match(r'1[345789]\d{9}', value):
            raise serializers.ValidationError('手机号码格式不正确')
        return value

    # 2.是否同意协议
    def validate_allow(self, value):
        # 注意,前段提交的是否同意,我们已经转换为字符串
        if value != 'true':
            raise serializers.ValidationError('您未同意协议')
        return value

    # 多字段校验, 密码是否一致, 短信是否一致
    # 1，密码是否一致
    def validate(self, attrs):
        password = attrs['password']
        password2 = attrs['password2']
        if password != password2:
            raise serializers.ValidationError('请重新输入密码')
            # 2.短信是否一致
            # 比较手机验证码
            # 获取用户提交的验证码
        code = attrs['sms_code']
        # 获取redis中的验证码
        redis_conn = get_redis_connection('code')
        # 获取手机号码
        mobile = attrs['mobile']
        redis_code = redis_conn.get('sms_%s' % mobile)
        if redis_code is None:
            raise serializers.ValidationError('验证码过期')
        redis_conn.delete('sms_'+mobile)
        if redis_code.decode() != code:
            raise serializers.ValidationError('验证码输入错误')
        return attrs

    def create(self, validated_data):
            # 删除多余字段
        del validated_data['password2']
        del validated_data['sms_code']
        del validated_data['allow']
        user = super().create(validated_data)
        # 调用django的认证系统加密密码
        user.set_password(validated_data['password'])
        user.save()
        # 补充生成记录登录状态的token  N 添加的token 字段序列只能是read_only使用
        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER
        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)
        user.token = token

        return user


# 添加地址
class AddressSerializer(serializers.ModelSerializer):
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label='省id',required=True)
    city_id = serializers.IntegerField(label='市id',required=True)
    district_id = serializers.IntegerField(label='区id',required=True)
    mobile = serializers.RegexField(label='手机号',regex=r'^1[3-9]\d{9}$')

    class Meta:
        model = Address
        exclude = ('user','is_deleted','create_time','update_time')

    def create(self, validated_data):

        # Address模型类中有user属性,将user对象添加到模型类的创建参数中
        validated_data['user']=self.context['request'].user
        return super().create(validated_data)

class AddressTitleSerializer(serializers.ModelSerializer):
    """
    地址标题
    """
    class Meta:
        model = Address
        fields = ('title',)






